CHICAGO — Starved for capital funding, the Regional Transportation Authority of Illinois unveiled a $2.5 billion borrowing proposal Friday that relies on projected growth in existing revenue streams and maintenance savings to repay.

The agency — which provides fiscal oversight of the Chicago Transit Authority, Metra commuter rail, and Pace suburban bus service — floated the plan at its board meeting Friday. Officials expect to submit formal legislation to the General Assembly during its next regular session that begins in early 2013.

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